examples/webgl_geometry_tessellation.html

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	<head>
		<title>three.js webgl - geometry - tessellation</title>
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			#info {
				color: #fff;
				position: absolute;
				top: 0px; width: 100%;
				padding: 5px;
				z-index:100;
			}

			a { color: red }

		</style>
	</head>

	<body>
		<div id="info"><a href="http://github.com/mrdoob/three.js" target="_blank">three.js</a> - geometry tessellation example</div>
		<div id="container"></div>

		<script src="../build/three.min.js"></script>

		<script src="js/Detector.js"></script>
		<script src="js/Stats.js"></script>

		<script src="fonts/helvetiker_bold.typeface.js"></script>

		<script type="x-shader/x-vertex" id="vertexshader">

			uniform float amplitude;

			attribute vec3 customColor;
			attribute vec3 displacement;

			varying vec3 vNormal;
			varying vec3 vColor;

			void main() {

				vNormal = normal;
				vColor = customColor;

				vec3 newPosition = position + amplitude * displacement;
				gl_Position = projectionMatrix * modelViewMatrix * vec4( newPosition, 1.0 );

			}

		</script>

		<script type="x-shader/x-fragment" id="fragmentshader">

			varying vec3 vNormal;
			varying vec3 vColor;

			void main() {

				const float ambient = 0.005;

				vec3 light = vec3( 1.0 );
				light = normalize( light );

				float directional = max( dot( vNormal, light ), 0.0 );

				gl_FragColor = vec4( ( directional + ambient ) * vColor, 1.0 );
				gl_FragColor.xyz = sqrt( gl_FragColor.xyz );

			}

		</script>


		<script>

		if ( ! Detector.webgl ) Detector.addGetWebGLMessage();

		var renderer, scene, camera, stats;

		var mesh, uniforms, attributes;

		var WIDTH = window.innerWidth,
			HEIGHT = window.innerHeight;

		init();
		animate();

		function init() {

			camera = new THREE.PerspectiveCamera( 25, WIDTH / HEIGHT, 1, 10000 );
			camera.position.z = 350;

			controls = new THREE.TrackballControls( camera );

			scene = new THREE.Scene();

			//

			attributes = {

				displacement: {	type: 'v3', value: [] },
				customColor:  {	type: 'c', value: [] }

			};

			uniforms = {

				amplitude: { type: "f", value: 0.0 }

			};

			var shaderMaterial = new THREE.ShaderMaterial( {

				uniforms: 		uniforms,
				attributes:     attributes,
				vertexShader:   document.getElementById( 'vertexshader' ).textContent,
				fragmentShader: document.getElementById( 'fragmentshader' ).textContent,
				shading: 		THREE.FlatShading,
				side: 			THREE.DoubleSide

			});


			var geometry = new THREE.TextGeometry( "THREE.JS", {

				size: 40,
				height: 5,
				curveSegments: 3,

				font: "helvetiker",
				weight: "bold",
				style: "normal",

				bevelThickness: 2,
				bevelSize: 1,
				bevelEnabled: true

			});

			geometry.dynamic = true;

			THREE.GeometryUtils.center( geometry );

			var i, n = 6, maxEdgeLength = 4;
			for ( i = 0; i < n; i ++ ) THREE.GeometryUtils.tessellate( geometry, maxEdgeLength );

			THREE.GeometryUtils.explode( geometry );

			var vertices = geometry.vertices;

			var colors = attributes.customColor.value;
			var displacement = attributes.displacement.value;

			var h, d, x, y, z;
			var nv, v = 0;

			for( var f = 0; f < geometry.faces.length; f ++ ) {

				var face = geometry.faces[ f ];

				if ( face instanceof THREE.Face3 ) {

					nv = 3;

				} else {

					nv = 4;

				}

				h = 0.15 * Math.random();
				s = 0.7 * Math.random();

				d = 10 * ( 0.5 - Math.random() );

				x = 2 * ( 0.5 - Math.random() );
				y = 2 * ( 0.5 - Math.random() );
				z = 2 * ( 0.5 - Math.random() );

				for ( var i = 0; i < nv; i ++ ) {

					colors[ v ] = new THREE.Color();
					displacement[ v ] = new THREE.Vector3();

					colors[ v ].setHSV( h, s, 1 );
					colors[ v ].convertGammaToLinear();

					displacement[ v ].set( x, y, z );

					v += 1;

				}

			}

			console.log( "faces", geometry.faces.length );

			mesh = new THREE.Mesh( geometry, shaderMaterial );
			mesh.rotation.set( 0.5, 0.5, 0 );

			scene.add( mesh );

			renderer = new THREE.WebGLRenderer( { clearColor: 0x050505, clearAlpha: 1, antialias: true } );
			renderer.setSize( WIDTH, HEIGHT );

			var container = document.getElementById( 'container' );
			container.appendChild( renderer.domElement );

			stats = new Stats();
			stats.domElement.style.position = 'absolute';
			stats.domElement.style.top = '0px';

			stats.domElement.children[ 0 ].children[ 0 ].style.color = "#555";
			stats.domElement.children[ 0 ].style.background = "transparent";
			stats.domElement.children[ 0 ].children[ 1 ].style.display = "none";

			container.appendChild( stats.domElement );


			//

			window.addEventListener( 'resize', onWindowResize, false );

		}

		function onWindowResize() {

			camera.aspect = window.innerWidth / window.innerHeight;
			camera.updateProjectionMatrix();

			renderer.setSize( window.innerWidth, window.innerHeight );

		}

		function animate() {

			requestAnimationFrame( animate );

			render();
			stats.update();

		}

		function render() {

			var time = Date.now() * 0.001;

			uniforms.amplitude.value = 0.125 * Math.sin( time * 0.5 );

			controls.update();
			renderer.render( scene, camera );

		}


	</script>

</body>

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